Hoisting mechanism.



PATENTED OCT. l0, 1905.

G. W. DAVIDSON.

HOISTING MECHANISM.

APPLICATION FILED APR.27.1905.

Attorn @ysY 1 h n lu S e S S e n ...n W

NTTED STATES PATENT OEEIOE. Y

GEORGE WASHINGTON DAVIDSON, OF ROFF, INDIAN TERRITORY, ASSIGNOR OF ONE-HALF TO RANDOLPH LAVVRENOE, OF ROFF,

INDIAN TERRITORY.

HOISTING NIECHANISIVI.

Patented Oct. 10, 1905.

Application filed April 27, 1905. Serial No. 257,675.

To rr/ZZ whom it may concern.-

Be it known that I, GEORGE WASHINGTON DAVIDSON, a citizen of the United States, residing at Rod, in the Chickasaw Nation, Indian Territory, have invented a new and useful Hoisting Mechanism, of which the following is a specification.

This invention relates to hoisting mechanism, and particularly to a novel form of block and tackle.

The object of the invention is to provide a block and tackle in which the maximum of power-can be secured at the minimum output of energy and which in use will positively preclude any twisting or turning of the blocks, thereby preventing cutting of the rope, which results when the leads thereof are crossed.

I/Vith the above and other objects in view, as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of parts of a block and tackle, as will be hereinafter fully described and claimed.

In the accompanying drawing, forming a part of this specification, and in which like characters of re ference indicate corresponding parts, the mechanism embodies two blocks, (designated generally l and 2,)the block l having combined with it two pairs of sheaves 3 and 4, the latter being of less diameter than the former, and the block 2 having combined with it a pair of sheaves 5 and a single sheave 6, the pair of sheaves 5 being' the larger in diameter and being of the same size.

The shell of the block l is cast from metal, and all its parts are integral, and consists of two cheek-plates 7 and a dividing-plate 8, the latter being combined at its upper end with a cross-plate 9, which is located ata point adjacent to the upper end of the shell and at its lower end with a cross-plate lO, forming the bottom of the shell. The cheek-plates extend above the cross-plate 9 and form a crest or bend 1l, with which is combined a hook l2, by which the apparatus may be suspended from a suitable support or may be combined with an object to be moved.

The block 2 is furnished with two cheekplates 13 and 14 and with a dividing-plate 15, which latter is combined witha cross-platel, disposed near the lower end of the block in the same manner as the corresponding plate 9 in the block l. Owing to the fact that one of the smaller sheaves is dispensed with in the block 2, the cheek-plate 13 terminates slightly above the periphery of the sheaves 5 and is combined with the dividing-plate by an angular extension 17, and from this point upward to the top of the sheave the dividingplate l5 constitutes a cheek-plate 18, which with the cheek-plate 14 forms a crest or bend 19, with which is combined a hook 20. The lower' end of the shell of the block 2 is formed into a crest or bend 21, similar to the part 1l of the block l, andlias combined with it a hook 22, which may be engaged with a suitable support or with an object to be moved or lifted. By forming all of the parts of the shell integral they are rendered more rigid and durable in use and may be more cheaply manufactured than when made in sections, and, further, the danger attending the loss of the assembling-bolts which are employed for combining the sections lof the shell as usually constructed is obviated.

The sheaves are mounted upon pintles or shafts 23, Which are suitably secured in cheekplates and extend through the dividing-plates and may be adapted for ready removal, if so desired. The rope 24 may be an ordinary ber cable or a wire cable and has one terminal combined with the hook 20, the other end of the cable being passed around one of the sheaves 4, thence down and around the sheave 6, thence up and around the other sheave 4, thence down and around one of the sheaves 5, thence up and around one of the sheaves 3, thence down and around the other sheave 5, and thence up and around the other sheave 3.

It will be noted that the hooks .l2 and '22 are looped around the bends l1 and 2l, and by this arrangement the hooks will be positively held against turning, thereby holding the blocks rigid in the line of stra-in. Furthermore, it will be seen that all the draft will be in a straight line, so that all danger of the blocks twisting when draft is applied tothe rope is obviated, and this is a feature of importance, especially where the blocks are to be used for moving heavy objects, such as houses and the like, when if the blocks twist it is impossible to bring them back to their Original position without stopping the operation of the winding mechanism, slackening the leads of the ropes, and adjusting the blocks. twists there is heavy wear, due to the friction between the crossed leads, thereby resultingv in rapid destruction of the rope, which will result in loss to the operator.

Having thus described the invention, what is claimed is- 1. A block having a shell, the parts of which are integral and consist of cheek-plates, the Vuploer ends of which are formed into a crest or bend, a dividing-plate, cross-plates with which the terminals of the dividing-plate are combined, and sheaves mounted between the plates.

2. A block having a shell, the parts of Furthermore, where the rope l which are integral and consist of cheek-plates,

the upper ends of which are formed into a crest or bend, a dividing-plate, cross-plates with which the terminals of the dividingplates are combined, one of the cross-plates terminating` short of the top of the block, and sheaves mounted between the plates.

In testimony that I claim the foregoing as my own I have hereto aftixed my signature in the presence of two witnesses.

GEORGE WASHINGTON DAVIDSN.

Witnesses:

TOM G. TAYLOR, RANDOLPH LAWRENCE. 

